The Sony a7S is unique among the alpha 7 series in that it has a fully electronic shutter option, called “silent mode”. Here’s the read noise histogram at ISO 400K with the shutter in silent mode and the drive mode set to single shot: The histogram is, to put it kindly, sparsely populated. At ISO… [Read More]
Archives for 2014
Sony a7S read noise in continuous mode
With the Sony a7 and a7R, I found that the bit-depth of the raw images was different when the camera was set in single-shot mode from when it was set in continuous (you hold down the shutter release and the camera takes pictures until you let go) mode. Would the a7S continue the pattern? You… [Read More]
Sony a7S read noise in single-shot mode
it’s amazing what you can learn about a camera with the lens cap on. In this post, I’m going to talk about what happens when you set the shutter mode to single shot and use the electronic first curtain to open the shutter and the mechanical (probably Copal) shutter to close it. The shutter speed was… [Read More]
Sony a7S testing
A Sony alpha 7S arrived yesterday for testing. Same origami box as the other alpha 7 cameras. Same lightweight documentation. Two nice differences: the a7S ships with two batteries and a battery charger. I guess they figure videographers will be going through batteries at a good clip. In one sense, the arrival of the camera… [Read More]
Sigma Quattro imaging architecture
Sigma has just started to ship the Quattro dp2, which departs from the original Foveon idea of having three vertically stacked pixels using the wavelength dependent absorption of light in silicon to, with a little point processing, end up with red, green, and blue pixels all captured from the same part of the image. The… [Read More]
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